wallpaper selector: progress indicator for thumbnail generation

.config/quickshell/ii/scripts/thumbnails/generate-thumbnails-magick.sh

@@ -47,6 +47,12 @@ generate_thumbnail() {
     local src="$1"
     local abs_path
     abs_path="$(realpath "$src")"
+    # Skip files with multiple frames (GIFs, videos, etc.)
+    case "${abs_path,,}" in
+        *.gif|*.mp4|*.webm|*.mkv|*.avi|*.mov)
+            return
+            ;;
+    esac
     local encoded_path
     encoded_path="$(urlencode "$abs_path")"
     local uri
@@ -58,7 +64,7 @@ generate_thumbnail() {
     if [ -f "$out" ]; then
         return
     fi
-    magick "$abs_path" -resize ${THUMBNAIL_SIZE}x${THUMBNAIL_SIZE} "$out"
+    magick "$abs_path" -resize "${THUMBNAIL_SIZE}x${THUMBNAIL_SIZE}" "$out"
 }
 
 # Parse arguments